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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedecfbe5e2b6c952dfa18333fef9c3f144558af2900ca3697b6eb03f521b755' 
  AND token = 'XhlKI3YQ7WN1+Kc0X+1cvIdMrvIdh1FTNZe4SBr8UyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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