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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd314126895286b6a2983392b0be3b4d89c2e3580832e6f35446e5098c1dab56' 
  AND token = 'cvhvndw0Vrw/8+HAak0f6L0QSI+EPhY1b9y6vGSEThI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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