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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf8c4cee55a675741c057390f3424dcd2b6fb777a115a56369d0e7f7a9523a4' 
  AND token = 'D6kGO2cu9vQOlHpPy+04QaYXAhQwhR3QzRGfNnmlCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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