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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbf49b42b15c7b90c59b32e847acf7e7b4c6c484d5649bf7980216295b9b04f' 
  AND token = 'qQhwOtNbihbOa8H35l++UJ7os+i/J3OsXLzrX3lSLH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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