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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547657c25f9f33fbd15d55024e1d8914da340a248a56a533637267705c30318d' 
  AND token = 'sO+Ir/NDRyIP+5tdSpmOOfoVDIMVUI9KTBb64kp6EkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}