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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40db9107a1e8542c01ba0994f8ffca66091ce199aea4359f6c1172c8df54816d' 
  AND token = 'f8vjafdxRwX1oiwOVck1aybrxNP0MISCpKL/AAuN9ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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