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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e9459e2484e40a47a0fd4710cb90f809111f90bcc77f9d009c1cf490aba215' 
  AND token = 'GDiY0l0olrc3dEMvj/S9AsLKwW8wqhpJu/M0apKObpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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