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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120fbec0d3a47240b3d78469e3f7e60faf9a07e10109bc155863c8f050589518' 
  AND token = 'hqx1U2O/D/XoGcNe5SahLetrkZ5rQyJCYS9hsX0atr0=' 
  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"
    }
  }
}