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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b648a53cf184e37ee48c412de459ed22f6626d3d2a7a80e12b616647e4ebdac' 
  AND token = 'dNv0XGu+2uAB7cJ9vap5my5G7dfRAhhxIXcd1j/synA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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