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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bad2d0d8148cfb18b020923cd09832e2111cf6947d26c1cac73f22cd23896d' 
  AND token = 'SpwA6axYa3Ok10yT8i8dN6AFWDK54Ey+4pH2Yzolo6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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