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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e4c2daa66fb300d5c56a70bfdb4be85b856420e8b4c6d7b8a8749677d96f54' 
  AND token = 'O1Ke371ieu7JRonJeBcL3DrPAnHNcongkF3OLWq0s/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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