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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab7f4be9e5fd220da840a9c8d4249e381bfc9aece14b2bef5542438a47545e6' 
  AND token = 'JW43YY4UfFCr2l27UZizvnw/ff2nWA9FPLrsc6/mvEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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