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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ef51c3619b11d8c8f78544889a3fff714aeae7646253f6ca2fdd57638af47b' 
  AND token = 'OX+fz07TLpDAxa5dcjW38x5nj5Ityv5uo+3yfw778Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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