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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4eaa3e17813cbb652c1ff890620a34559028b4ecd82065eb63bf26d4fe2cf8' 
  AND token = '8tCdqBy6gFl3r6hN6d+/GR47C3MEDSUTkFjcqPObb1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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