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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eb9f5e63086ea551071fb9b0c57b3713a8342ef8eee9f23f6531eee2ef2022' 
  AND token = 'i47FtvAqTB9srNBLdxn8/HGfpF59eOyZmv0OPk16ijE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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