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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332b988261bb5ec9d4b6eb5da60569a0aa8607d9489993751cd557f42f5bf8bc' 
  AND token = 'w6GvfHG7lpD4MA30YXppi1wddxBly/RFyssQWHrqkxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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