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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e68f28c1d1d8e1b838013231aba4f127c6f0e2678a1eb548dfd9671538b4622' 
  AND token = 'w6FaYVvs74mT5yrm3ifn0QD6gRdknRgQTOVVy7g6z0I=' 
  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"
    }
  }
}