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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c2a957c5f07620274b089b9da63027fdb2049434d2dc6b04f289ed3260d974' 
  AND token = '5YxOx+ieJ503MVoI1rvo3BksqZyxLiDHh9/Kx4AxTi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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