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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e895d8e7834e9895bcb155114054f57eaafe03c5197e9c44ff1f5f52a232d89' 
  AND token = 'NZtL82KpPAmkZqlFAR0eeoOoYrLwNRFYqdGa7ch3Pdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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