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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a705f6b69c8275de89cd63713c2cfbb4156d54e6d3c9eec272af487b0c7058' 
  AND token = '/mYRDTLmuP2/87au6krFIQG6DZHbJ0POwsTv2B67AjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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