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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ffb17ffb6a4c1ddfeae281202dbae326cee00786c33329b4ef28031b7265f1' 
  AND token = 'iiLq/ZIrkEo6p9O6LOgt2IsEkzS4b39iEfrJaS+D2II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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