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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86debbbfeff6915be99924611f3b81eb4f716fae97658d4b06a932a5bab4cc65' 
  AND token = 'WrBbhCSYjcLldsGf51+t398fLadmbb6N+hIGK+Cc0yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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