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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b46b9053e6bdcb86e9d629375f620325dcacfc4794ad088087c282edb3ef53' 
  AND token = 'hXoD3e03PJOn8dOdltJfNwra9GpaY5+p5OMA+iapN3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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