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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee7c75dac54c6b1bd7e9228a91c28658327f4a0fb16176f051088aece6e9467' 
  AND token = 'aqGBPjclFKn9s+KOBMlkcsClAS2bjJ03p/1tVWkpQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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