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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce43c490fea8f15ec2b720012bd0b6930b1b7a4c4ac05eb173747d3bf59ac83' 
  AND token = 'RDoQ0vR5EHwLQ7f9+vBhWWtFXQDZ7H5cbLY0YypZUbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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