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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fbf52ef2549f20e9952a57aadf909f08cdc6903a3963f45bf329b833593cdb' 
  AND token = '6imtJH+9jzk9s+Mvocb89aEwrwoQF4LD7xU4EAMe0Ik=' 
  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"
    }
  }
}