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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab8a965f9b024806046795338b29539c32a2485d448f8f81cf1d6a6a3c99eca' 
  AND token = '4EePCeM7cBmoR1KGY8emDYHJLYU1iL5+n8vM3Oni6+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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