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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee760c637b6b6cdc3c0607b00739bae618845dd0a73208a58ccf0ad60766c116' 
  AND token = 'WcwVn7/50caq7Op2+M4KnEDF6WN4nEcD1wVj2pgW4D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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