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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdc3fbae1724bfaf0f99c0b1b3f2ddc33a18c8f798a3b036a33d88c5e1c7518' 
  AND token = 'LKe7sH1+Pr4DuEHRPXo4QUKv8O8rOVRzJkIp4GKfPEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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