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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531384b389f60ca0da7e5838e56015fb4e3b1e8eb8464f846c11f5b9bc499403' 
  AND token = 'v2tbldrb6G0y6cLUihgbYMDjZV1TO9ZFHXuAfrAICqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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