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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617fa92f41bcd2fef7d7dda516b10656e70e4862b059b0112dfb27b8f495ce96' 
  AND token = 'swiuGbpVsX1U6nb3WU7VnyiGeiMOYI1hTt2HAyCQdSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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