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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5576b80d78f4208fe248e52c8cd1a4bb065058d7678ec27197793d798768b9' 
  AND token = '4FQI2amtZr86Mr+dl+S5qG0V8ik4mXoKg2Du4kZvrBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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