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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3ebb548923840d0e476cecdfc2c4dd50058c3e3413c4effe62d3ef446b92ec' 
  AND token = 'p4UMxnrQt9aSbDKIfvLfcnv8C5VEsl408RcDtDBK/As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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