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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763bbf2ac55a76883502e6d5f3aff99d6ac34451686d3b714662d9c53a66cabf' 
  AND token = 'g+M6u0VEgJmtTSONuK07VQ6g0NoVWHNcWnBl3c8lZQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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