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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041a60314bb4d47561644c8875c62353ff97436e21f9e2cc8224d305bc99a00b' 
  AND token = 'llpuvmmFu95/pxGre5WhcUR59F//AO3PMW1D5HK3cws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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