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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a73683737e9a737c97ecd9b780d044273b48ebd8615d9e2af0e0382a5f6a12' 
  AND token = 'qG4/Zb52D6Bp6rPFn4orFcdETtBmEAQ0ze368dw8ArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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