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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2703dccc7beb5fbe31bedd5341b36d31a4304a74f65c8eb5657f16f37b5ee8d5' 
  AND token = 'g/YvhrglBWbY42g+xI7TCIspdyW4GcIR6k1zaD8Qt3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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