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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4b5486f43c90d36800539050e0e75ad55fea786e4a0a90f3642f96fcb234d' 
  AND token = '85ZVt4wpSM9WhAZFoAYeGehDckk1/dCYno1TmfpW+8A=' 
  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"
    }
  }
}