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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8f21e2facfb3fc854806bceaa4e40b44ad34bbdda9725af3847f6cdbe7f9a2' 
  AND token = 'FFNN0YqwJLFnM4rvwgd/yLVEVjbraZEddv3z9RExZ5c=' 
  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"
    }
  }
}