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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898a62036f95257ace492c8687f2efee266660f328eeee051de5fa804f358dca' 
  AND token = 'XpNmDA2ByRzrjByAQA3aIY9vg8ZnoR1j1IAZGXE6uuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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