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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4a00d0741a38c7c1c1566f708dcba53f749340a7c6aa2f02d4210a815bae73' 
  AND token = 'dtR8A/5+lBizipMsTpYSRaHYqdYrlIsmXOFoUQntfq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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