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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a259f76e88c9bac1eb5d36d1a2fc1971eb34f2a20ab4b3d9ced95186985fc60' 
  AND token = 'qEwMbt14HwMC977S57LEh7wHDiuATwcq4avwZaodAvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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