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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b4943c93eee56bb83809b76f6308ad1e4af34be6c516aafccf55a627531b40' 
  AND token = 'srL7wH2wVfJHfJa3fBFJuMhITSRGBrdV0E1r5HF/sLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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