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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8754e0ac1f85b0cbda35d974f27710ffed84a1c97bdfb293c61e3edb2ce02d3' 
  AND token = 'qQ8NNCzs88JWTAUAdTEV30aDd37jwpYtVORqI1awHzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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