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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9b20d3bf5d08a24013fe7c3fe6192a828c943fd95084574f3344d2552ea85f' 
  AND token = 'PFWq+P0203bPde5WVcbxuxOJ6bmILe0CFqbg0MmKNbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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