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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a11b47c540cd6d62f8300b82c2e132ee51d13e30518d13055e0d34ed152a3c' 
  AND token = 'BlTAueHKd29TQjkAiSbohVopmsfwQptIciedwypvY2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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